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so, just set off out for an hour and had to turn back because the brake lever is coming back to the bars but only when I'm moving. I can squeeze the lever while its still and it feels solid but as soon as I try to brake while moving I can feel the lever coming back, had the pads out and nothing wrong there, checked for leaks cant see anything and the fluid level doesn't seem to be going down. I havent touched the brakes since last year when I fitted braided hoses so its not like theres any air in the system. got me stumped.

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wd40? I have no idea if it will work but Dave swears by it lol hide

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@melly wrote:
wd40? I have no idea if it will work but Dave swears by it lol hide


in fact I am sure it will not help at all, but couldn't resist it Embarassedhide

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it sounds like some thing is pushing the pistons back in the calliper when you are moving , meaning there is not enough travel in the lever to push the pads on to the disk

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Figured it out with help on another forum. Seems like the master cylinder seal has gone. If i squeeze the lever slowly and gently it will allow fluid past it back to the reservoir and the lever comes back to the bar. If i pull the lever quickly the seal balloons out and works as it should so the next dilemma, new seals (£40) new master cylinder (£130) or brembo/ acossatto radial racing master cylinder (£180)

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so the next dilemma, new seals (£40) new master cylinder (£130) or brembo/ acossatto radial racing master cylinder (£180)


Depends whether you are happy with the performance of the stock master cylinder and/or whether it's a weak point on your particular bike model, but it would be either new seals or an upgraded M/C for me.

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